[protocol]: Handle empty last chunk

[sportron-ledger]

Description

Please provide a detailed description of what was done in this PR.
(And mention any links to an issue docs)

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

Breaking changes

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Additional comments

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.29%. Comparing base (52dab0b) to head (f2e9785).
⚠️ Report is 525 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1051   +/-   ##
=======================================
  Coverage   62.29%   62.29%           
=======================================
  Files          13       13           
  Lines        1809     1809           
=======================================
  Hits         1127     1127           
  Misses        682      682           

Flag	Coverage Δ
unittests	62.29% <ø> (ø)

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